CVTS Thesis Topics

A cardiovascular and thoracic surgery protocol is judged on internal consistency: the research question, objectives, methodology and statistical plan must all describe the same study. The primary objective should be a single measurable endpoint — one profile, one association, one comparison between two defined groups — with everything else demoted to secondary objectives.

Define the cohort by the decision that produced it. Every patient here has passed through a referral filter and most have passed through a treatment-allocation decision as well, and that second filter is sharper in this speciality than in almost any other. A series of rheumatic mitral stenosis "referred for surgical management" systematically excludes the pliable, minimally calcified valves that went for balloon valvotomy, so the cohort is enriched for subvalvular disease and calcification. A coronary series excludes the anatomy that was suitable for percutaneous intervention. An aortic stenosis series may exclude those routed to a transcatheter valve, and an aortic aneurysm series those managed endovascularly. State the entry point exactly — referred, evaluated, accepted for surgery, or operated — use the same phrase in the title and the inclusion criteria, and say in the discussion which direction the filter has pushed your cohort.

Specify the echocardiography completely. Roughly half these topics rest on echo, and it is not one measurement but many, made differently in different laboratories. State whether the study is transthoracic or transoesophageal, the machine, and who performed and reported it — a cardiologist, a sonographer or the surgical resident — since that determines whether the reading is independent of the clinical assessment being correlated. For ejection fraction, name the method: Simpson's biplane, the linear method or visual estimation. They are not interchangeable, and the linear method is not valid where there are regional wall motion abnormalities, which is precisely the coronary population in the first group. For chamber dimensions, valve areas and aortic diameters, state whether values are indexed to body surface area and give the formula used, because unindexed absolute measurements are misleading in Indian body habitus.

Be honest about pulmonary artery pressure. Several topics correlate it with valve or shunt severity. It is not measured on echocardiography; it is estimated from the tricuspid regurgitant jet velocity plus an assumed right atrial pressure, and in a substantial minority of patients there is no adequate jet to estimate from. The protocol must state the estimation method, the assumption used for right atrial pressure, and what happens to patients in whom it cannot be obtained — they must be reported as unmeasurable rather than silently dropped, since excluding them selects out a particular group. Where catheter pressures are available in the congenital or advanced heart failure work-up, say which source is used and do not mix the two.

Name the grading and classification systems with their versions. Coronary severity needs a stated stenosis threshold and a named scoring system rather than a vague description of extent, with the reader identified, because visual estimation of stenosis is known to be poorly reproducible. Aortic dissection uses the Stanford classification, already in your titles. Chronic venous disease uses the CEAP classification and peripheral arterial disease the Rutherford or Fontaine stages. Suspected deep vein thrombosis uses a named clinical probability score, and the protocol must state whether the ultrasound was a proximal compression study or a whole-leg examination, since the two detect different things. Lung cancer staging must state the edition of the staging system. Where a preoperative risk score is used, name it with its version.

Fix the timing. Preoperative echocardiography or angiography may be weeks or months old by the time of surgery; define "preoperative" as within a stated interval and record the actual gap. For the bypass topics, "immediately after" needs a defined moment — on separation from bypass, on arrival in the intensive care unit, or at a stated hour — applied identically to every patient.

A CVTS synopsis is the condensed document of two to four pages — title, introduction, aim and objectives, brief methodology, sample size and references — submitted for registration of the dissertation topic. The CVTS protocol is the expanded version of twelve to twenty pages carrying the full review of literature, detailed methodology including the echocardiographic and imaging protocol with measurement definitions, grading and classification systems with their versions, observer arrangements, statistical plan, study timeline and annexures including the patient information sheet, consent form and data collection proforma.

Three annexures repay attention here. The measurement proforma should list each echocardiographic and imaging variable against the method and view used, so that case one and case ninety are measured the same way regardless of who is on duty. The consent set usually needs three versions: the patient's own, a parental form with a child assent section for the congenital group, and a surrogate form for patients enrolled while sedated or on circulatory support. And where the study touches transplantation or mechanical support, a short note on data handling is worth including, since those records contain candidacy decisions that are sensitive.

In practice the synopsis is extracted from the protocol rather than written separately, which is faster and produces a more coherent document. Check your university's prescribed proforma before submission, since rejections on formatting grounds are common and entirely avoidable.

Match the formula to the design. Profile and spectrum studies use a proportion-based calculation on the commonest category you intend to estimate. Comparative topics between two defined groups — diabetic against non-diabetic coronary anatomy, mitral against aortic disease, type A against type B dissection, smokers against non-smokers — need a two-proportion or two-mean calculation with both expected values referenced. Correlation topics such as ankle-brachial index against Doppler severity, or ventricular septal defect size against pulmonary artery pressure, use the expected correlation coefficient. Where imaging is tested against histopathology, as in the pulmonary nodule topics, size on the expected sensitivity and the anticipated prevalence of malignancy, remembering that only the diseased contribute to the sensitivity estimate.

Check accrual against the theatre logbook before committing. Coronary bypass, rheumatic valve disease, varicose veins, empyema and peripheral arterial disease accumulate steadily in Indian units. Heart transplantation, mechanical circulatory support and extracorporeal membrane oxygenation are performed at a small number of centres and in small numbers even there; abdominal aortic aneurysm and lung resection volumes vary enormously between institutions. Count two years of cases by diagnosis, and if the number is thin, either widen the entry point from operated to referred, or add a retrospective arm and say so.

Two limbs are not two patients. This is the commonest analytical error in the vascular group. Varicose veins, peripheral arterial disease and diabetic foot studies routinely include both lower limbs and then analyse them as independent observations, which inflates the sample and narrows the confidence intervals falsely, because the two legs of one patient share every systemic risk factor. Decide in the protocol whether the unit of analysis is the patient or the limb; if the limb, account for clustering. The same applies to multiple coronary vessels, multiple pulmonary nodules and bilateral carotid disease.

The bypass comparisons are paired. Comparing haematological parameters before and immediately after cardiopulmonary bypass is a within-patient design and needs the paired t-test or the Wilcoxon signed-rank test, not the independent-samples versions. Interpretation needs care as well: a fall in haemoglobin across bypass is substantially haemodilution from the circuit prime rather than loss, so record the prime volume, any cell salvage and the fluid balance, and say in the analysis plan that the change cannot be attributed to a single mechanism.

Handle the ankle-brachial index correctly. Medial arterial calcification in diabetes and chronic kidney disease makes the vessels incompressible and drives the index falsely high, so in exactly the population three of these topics study, a normal or elevated value does not exclude disease. State a rule in advance for readings above the accepted upper limit — report them as non-compressible and analyse them separately rather than pooling them with normal results — and mention toe-brachial pressure where your unit can measure it. Agreement between the index and Doppler grading is reported as kappa for categorical severity and by Bland-Altman analysis for continuous comparison, never as a correlation coefficient alone.

Name the remaining tests. Proportions use the chi-squared test with Fisher's exact test for sparse cells. Continuous variables use the independent t-test or Mann-Whitney U test with a stated normality test; pressures, gradients, diameters and durations are usually right-skewed, so plan for medians. Ordinal variables such as functional class, CEAP category and Rutherford stage are analysed with rank-based tests and correlated using Spearman, not converted into means. Where a continuous measurement is being evaluated for a diagnostic threshold, use receiver operating characteristic analysis with the area under the curve and a derived cut-off.

Start with the theatre logbook rather than the outpatient register, and count two years of cases by diagnosis. In a surgical speciality the operating list determines what you can study, and the range across Indian units is wide: a busy centre may do several hundred bypass and valve procedures a year while performing no lung resections at all, or run a large vascular service with no congenital programme.

Then check which investigations your patients actually arrive with. Cardiac topics depend on the echocardiography laboratory — who reports, whether reports are structured and complete, and whether the numbers you need are recorded routinely or only when someone thinks to. Vascular topics depend on duplex availability and on whether ankle pressures are measured as a matter of course. Aortic and thoracic topics depend on computed tomography access and on whether angiographic studies are done in-house or the patient is sent elsewhere. A protocol requiring a measurement that is not part of the routine work-up becomes a study that adds investigations, which changes both the ethics submission and the cost.

Finally, be realistic about the low-volume areas. Transplantation, mechanical circulatory support and extracorporeal membrane oxygenation are genuinely interesting and genuinely scarce; unless you are at one of the few high-volume centres, a topic in those areas needs a long retrospective window or a modest, honestly stated sample.

Cross-sectional observational and analytical designs dominate: clinical, echocardiographic, angiographic and radiological profiles of a defined condition; comparison of two anatomically or aetiologically defined groups; and association between a measurement and a clinical or functional finding. Correlation of a non-invasive measurement with a reference investigation, spectrum studies of disease referred to a unit, and audit-style studies of perioperative practice and component use are equally well established.

Retrospective designs built on operative records, echocardiography archives and imaging are accepted and are frequently necessary for less common conditions. Perioperative topics comparing values before and after bypass are within scope because the interval is hours. Comparative surgical outcome studies, and anything requiring randomisation between operative strategies or long-term graft or valve follow-up, are generally outside postgraduate scope for both numbers and duration.

Bring three to five shortlisted titles rather than one, since guides frequently rule out a topic on grounds you could not have known — a departmental study already running, a senior resident holding an overlapping subject, a perfusion or imaging service about to change, a referral stream shifting as a nearby centre starts a competing programme.

Settle five things in that meeting: operative volume in the relevant diagnosis over two years, which investigations are routine and who reports them, the exact entry point of the cohort and therefore what the title may honestly claim, who will make and verify the measurements and who will act as the second blinded observer, and which journal the eventual paper is aimed at. Where the topic depends on another department — cardiology for echocardiography and catheterisation, radiology for angiographic imaging, pathology for histology, the blood centre for component data — secure that cooperation in writing rather than assuming goodwill will hold for three years.

Yes, and for less common conditions it is often the only viable route. State the archive period, how cases were identified from the operative register or the reporting system, and the completeness of retrieval.

Four cautions specific to this speciality. Echocardiography reports are not a dataset. Free-text reports frequently omit the exact variable you need, and where the report gives an ejection fraction it may not say by which method; check a sample of reports from your intended period before you build a study on them, and where the images are archived, consider re-measuring. Practice allocation shifts. If your unit or a neighbouring one began offering transcatheter valves, endovascular aortic repair or off-pump surgery during the archive period, the surgical cohort changed composition at that moment; record the period per case and look for a step change before pooling. Risk-factor data are inconsistently captured. Smoking exposure in pack-years, occupational standing hours and duration of diabetes are recorded well in some clinics and not at all in others; report the proportion missing rather than analysing only the complete records without comment. Perfusion data live separately. Bypass and cross-clamp times, prime volume and cell salvage are in the perfusion chart rather than the case sheet, so confirm those records are retrievable for your period before choosing a bypass topic.

The synopsis is the condensed two to four page document submitted for topic registration. The protocol is the full document of twelve to twenty pages containing the detailed review of literature, methodology with the echocardiographic and imaging protocol, measurement definitions, grading and classification systems with their versions, observer arrangements, statistical plan, timeline and annexures. The synopsis is normally extracted from the completed protocol.

Full institutional ethics committee approval before data collection. Four points need explicit attention in this speciality.

Children and the congenital group. Ventricular and atrial septal defect, tetralogy and paediatric congenital topics require written parental or guardian consent together with the child's assent above the age your committee specifies. Supply both forms as separate annexures.

Patients who cannot consent at enrolment. Extracorporeal support, acute dissection, acute limb ischaemia and postoperative intensive care topics enrol patients who are sedated, ventilated or acutely unwell. State who may consent on their behalf under the term your committee uses, supply a surrogate form, and state that consent is sought again from the patient if capacity returns.

Candidacy and rationing decisions. The transplantation and mechanical support topics record who was considered suitable and who was not, and in Indian practice the reasons frequently include affordability and social support alongside the medical criteria. State that these records are handled in aggregate, that individual candidacy decisions are not identifiable in any table, and that the study does not influence any listing decision. Where the work touches organ donation, note compliance with the governing transplantation legislation.

Additional sampling and imaging. Where the study needs a blood sample or an investigation beyond routine care, state it and justify it — cardiac surgical patients are already subject to heavy diagnostic phlebotomy. Where clinical photographs of limbs or wounds are used, obtain separate photographic consent and state how identifying features are handled.

Purely retrospective record-based studies may be granted a waiver of consent, applied for explicitly. Clearance commonly takes six to ten weeks and retrospective approval is not granted.

As measurements with a stated method and a known variability, not as facts read off a report. Three rules cover most of it. First, name the technique for every variable: which method was used for ejection fraction, which view and which frame for chamber dimensions, which equation for valve area, and whether values are indexed to body surface area with the formula given. An ejection fraction obtained by visual estimation and one obtained by Simpson's biplane should not sit in the same column without comment, and the linear method should not be used at all where regional wall motion abnormalities are present. Second, say who performed and reported the study and whether that person knew the clinical findings you are correlating; where the resident is both the clinician and the echocardiographer, blinding is impossible and the protocol should acknowledge it rather than claim otherwise. Third, report reproducibility. Have a second observer independently remeasure a defined subset, at least ten to twenty per cent, blinded to the first reading, and give the intraclass correlation coefficient for continuous values and kappa for categorical grading. For pulmonary artery pressure, state the estimation method, the right atrial pressure assumption and the number of patients in whom no adequate tricuspid regurgitant jet was available — those patients are a finding in themselves, not a gap to be quietly excluded.

Substantially. A PhD proposal typically runs 6,000 to 10,000 words and carries an extended critical literature review, a theoretical framework, a detailed methodology chapter and a discussion of expected contribution to the field. An MCh synopsis is a two to four page registration document. The research question can be the same; the depth expected is not.

Most universities require registration within six to nine months of joining. Shortlist in the first two months, finalise with your guide by the third, and file for ethics clearance immediately afterwards. In a three-year superspeciality programme with heavy theatre and intensive care commitments, protect the timeline deliberately: fix the data collection window to close at least eight months before submission, because the final year offers very little uninterrupted time for analysis and writing.